🧬 ICD-10 CM L97.919 — Non-Pressure Chronic Ulcer Of Unspecified Part Of Right Lower Leg With Unspecified Severity
Billable Code Confirmed
ICD-10 CM L97.919 is a fully specified 7-character billable code because it captures anatomic side (right), general lower-leg location, and a severity placeholder digit, satisfying ICD-10-CM’s requirement that non-pressure ulcer codes carry laterality all the way to the final character before they can be reported for reimbursement.
Non-Billable Parent Codes
L97 is the category-level parent and cannot be billed alone because it has not yet specified anatomic site, laterality, or severity, all of which are required to reach a valid code. L97.9 identifies only that the ulcer’s exact part of the lower leg is unspecified but still lacks the laterality and severity characters needed for billing. L97.91 narrows the code to the right leg but remains non-billable until the sixth-character severity digit is added, which is what ultimately produces L97.919.
Clinical Context
The deciding clinical factor for L97.919 versus a sibling code is that the treating provider has not documented (or the wound has not been formally staged for) depth of tissue involvement, so the coder defaults to the “unspecified severity” digit rather than skin breakdown, fat exposure, or muscle/bone necrosis.
Code Classification
This is a diagnosis code describing a chronic non-pressure skin ulcer of the lower leg; it is not a procedure code and does not itself represent debridement, grafting, or any surgical intervention performed on the wound.
🔍 Code Description
ICD-10 CM L97.919 sits within the L97 category of ICD-10-CM, which was created to capture chronic, non-healing ulcers of the lower limb that arise from causes other than sustained pressure, most commonly venous insufficiency, arterial occlusive disease, or diabetic peripheral neuropathy. Because these wounds behave and heal so differently from pressure injuries, the Tabular deliberately separates them from the L89 pressure ulcer family and instead groups them by the specific segment of the lower extremity involved, such as thigh, calf, ankle, heel, foot, or, as in this case, an unspecified part of the lower leg itself. The code further requires the coder to specify laterality as right, left, or bilateral, reflecting CMS’s broader push toward side-specific reporting across the musculoskeletal and integumentary chapters, and ends with a severity digit describing how deep the wound extends into the soft tissue.
ICD-10 CM L97.919 specifically represents the combination of “unspecified part of the lower leg,” right-sided laterality, and unspecified severity, meaning the documentation confirms a chronic non-pressure ulcer of the right lower leg but does not specify a more precise anatomic subsite or wound depth. This code is frequently assigned when a wound care consult note, admission history and physical, or emergency department record references a “chronic right leg ulcer” without a formal staging exam, which is common in early inpatient encounters before a wound care specialist has fully evaluated the lesion. Coders should always review nursing wound assessments and any wound care or vascular surgery consult notes before finalizing this code, since those documents frequently contain the depth detail needed to assign a more specific severity code such as L97.911 or L97.912 instead.
🌳 Code Tree / Hierarchy
L97 Non-pressure chronic ulcer of lower limb, not elsewhere classified ❌ Non-billable
│
├── L97.1- Non-pressure chronic ulcer of thigh ❌ Non-billable (requires additional characters)
├── L97.4- Non-pressure chronic ulcer of heel and midfoot ❌ Non-billable (requires additional characters)
│
├── L97.9 Non-pressure chronic ulcer of unspecified part of lower leg ❌ Non-billable
│ │
│ ├── L97.91 Non-pressure chronic ulcer of unspecified part of right lower leg ❌ Non-billable
│ │ │
│ │ ├── L97.911 ...limited to breakdown of skin ✅ Billable
│ │ ├── L97.912 ...with fat layer exposed ✅ Billable
│ │ ├── L97.913 ...with necrosis of muscle ✅ Billable
│ │ └── L97.919 ...with unspecified severity ◀ THIS CODE ✅ Billable
│ │
│ └── L97.92 Non-pressure chronic ulcer of unspecified part of left lower leg ❌ Non-billable
│ │
│ ├── L97.921 ...limited to breakdown of skin ✅ Billable
│ └── L97.929 ...with unspecified severity ✅ Billable
│
└── L97.8- Non-pressure chronic ulcer of other part of lower leg ❌ Non-billable (requires additional characters)
Severity Specificity Drives CDI Value
Selecting L97.919 over a sibling like L97.911 matters because payers and RADV auditors increasingly expect the medical record to support wound depth explicitly, and an unspecified-severity code invites scrutiny or denial when a wound care note elsewhere in the chart clearly describes a staged depth.
Tip
Always confirm laterality against the physical exam or wound photo documentation before finalizing this code, since defaulting to “unspecified part” or the wrong side is one of the most common lower-extremity ulcer coding errors caught on inpatient audit.
✅ Includes
Chronic ulcer of skin of lower limb NOS is the general clinical term this code was built to capture when no further anatomic or etiologic detail is available. Non-healing ulcer of skin refers to a wound that has failed to progress through normal healing phases over an extended period, which is the defining clinical feature of any code in the L97 family. Non-infected sinus of skin describes a draining tract without documented pressure etiology, which still falls under this code family rather than an infection-specific code unless a secondary infection is separately confirmed. Trophic ulcer NOS and tropical ulcer NOS are older clinical terms sometimes still used in documentation, particularly by providers trained outside the U.S. or in older transferred records, and both map to this same code family when the lower leg location is unspecified.
❌ Excludes
Excludes 1
There is no Excludes1 note published under L97 in the current ICD-10-CM Tabular List; the Tabular instead relies on Excludes2 notes and a “code first” instruction for underlying etiology, so no mutually exclusive code pair applies here.
Danger
The most common error coders make is treating the “code first” underlying-etiology instruction (for conditions like atherosclerosis or diabetic ulcer) as an Excludes1 conflict and omitting L97.919 entirely; the etiology code and the L97 ulcer code are meant to be reported together, not as alternatives to one another.
Excludes 2
L89 pressure ulcer codes may be reported alongside L97.919 only if the patient genuinely has two distinct wounds, one pressure-related and one non-pressure-related, since the two categories describe different pathophysiology and neither substitutes for the other. Skin infection codes from the L00-L08 range may also be reported together with L97.919 when a chronic ulcer becomes secondarily infected, since the infection itself is a separately codeable complication rather than a feature already captured by the ulcer code.
📋 Clinical Overview
Severity Specificity Across the L97.91 Family
The right lower leg ulcer codes under L97.91 exist on a severity spectrum ranging from superficial skin breakdown to full-thickness necrosis reaching bone, and L97.919 sits outside that spectrum entirely as the “not documented” placeholder rather than representing a true clinical severity level. This distinction matters clinically because a wound limited to skin breakdown carries a very different treatment plan, healing timeline, and complication risk than one with muscle or bone necrosis, yet both could be miscoded as L97.919 if the note simply says “chronic ulcer” without a depth exam. The table below contrasts L97.919 with the two ends of that severity spectrum to illustrate why documentation specificity changes both clinical management and coding accuracy.
| Feature | L97.919 | L97.911 | L97.914 |
|---|---|---|---|
| Documented depth | Not specified in the record; the coder cannot confirm how far the wound extends into soft tissue. | Limited to the epidermis and dermis, meaning the wound has not yet breached the subcutaneous fat layer. | Necrosis has reached and destroyed bone, representing the most severe classification in this code family short of associated osteomyelitis. |
| Typical clinical setting | Early admission notes, transfer records, or brief consult mentions before formal wound staging occurs. | Early-stage venous or diabetic ulcers caught on routine skin checks. | Long-standing, poorly controlled wounds often associated with severe peripheral arterial disease or uncontrolled diabetes. |
| Coding/CDI implication | Should trigger a CDI query for wound depth whenever a wound care or surgical note elsewhere in the chart contains staging detail. | Straightforward assignment once skin-only involvement is confirmed on exam. | Often coexists with osteomyelitis (M86.-) or gangrene (I96), both of which should be separately investigated and coded if documented. |
Important
A CDI query should be generated whenever nursing or wound care documentation describes measurable wound depth (for example, “tunneling to fascia” or “exposed tendon”) but the physician’s own diagnosis statement simply says “chronic leg ulcer,” since that gap is exactly what an unspecified-severity code like L97.919 is meant to flag for follow-up.
Manifestations & Symptom Burden
Chronic non-healing wound drainage is frequently the presenting complaint, often accompanied by a foul odor if bacterial colonization is present. Peri-wound erythema and induration can signal either normal chronic inflammation or an early secondary infection requiring separate coding. Pain out of proportion to wound size may suggest an arterial etiology rather than venous, which should prompt a vascular workup and possible additional diagnosis coding. Lower extremity edema is common with venous-etiology ulcers and should be evaluated for a separately codeable venous insufficiency diagnosis. Delayed healing beyond four to six weeks despite standard wound care is the clinical threshold most commonly used to classify a wound as “chronic” for purposes of this code family.
Tip
Document and code any of these manifestations only when they represent a distinct, separately evaluated condition rather than an inherent feature of the ulcer itself, since ICD-10-CM guidelines discourage coding symptoms that are integral to the underlying diagnosis.
💰 HCC Risk Adjustment
ICD-10 CM L97.919 maps to HCC 161 (Chronic Ulcer of Skin, Except Pressure) under the CMS-HCC V28 model that became fully effective for payment year 2026, so it carries measurable RAF weight for Medicare Advantage risk scoring when properly documented and reported. Because severity is unspecified in this particular code, CDI teams should treat it as a flag for potential specificity improvement rather than a final answer, since a more precise severity code captures the same HCC while better supporting audit defensibility. Annual recapture with current MEAT documentation is required for this diagnosis to continue contributing to a patient’s risk score in each new calendar year. Providers should also be encouraged to document and code the underlying etiology (venous, arterial, or diabetic) whenever clinically supported, since that etiology code may independently map to its own HCC category and add further RAF value.
🏥 MS-DRG Assignment
As principal diagnosis on a purely medical inpatient stay, L97.919 groups to MDC 09 and the medical DRG triad of DRG 592 (with MCC), DRG 593 (with CC), and DRG 594 (without CC/MCC), with final assignment depending on secondary diagnoses such as sepsis, acute kidney injury, or malnutrition. If the admission instead includes an operative skin graft procedure to close the ulcer, the encounter groups instead to the surgical DRG triad of DRG 573 (with MCC), DRG 574 (with CC), and DRG 575 (without CC/MCC), which carry a substantially higher relative weight than the medical triad. Coders should always check the procedure list before finalizing DRG assignment, since even a minor bedside debridement can shift grouping logic depending on how it is coded in ICD-10-PCS. A frequent inpatient pitfall is omitting the etiology code required by the “code first” instruction, since that omission can understate the case’s true CC/MCC burden and lead to DRG underpayment.
🔗 Related ICD-10-CM Codes
Same laterality, differing severity: L97.911, L97.912, L97.913, L97.919 itself, L97.9 series requiring further characters for necrosis of bone or muscle involvement without necrosis.
Contralateral and etiology-adjacent codes: L97.921, L97.929 for the left lower leg equivalent, along with the underlying etiology categories that must be sequenced first when documented, including atherosclerosis of the lower extremities, chronic venous hypertension, postphlebitic or postthrombotic syndrome, varicose ulcer, and diabetic ulcer codes from the E08-E13 diabetes families.
🛠️ Commonly Associated CPT Codes
97597 describes selective debridement of an open wound including the first 20 square centimeters, which is the most frequently billed procedure for routine bedside wound care on a chronic leg ulcer. 11042 captures surgical debridement of subcutaneous tissue for the first 20 square centimeters or less and is used instead of 97597 when the debridement reaches below the dermis into fat. 15271 applies to placement of a skin substitute graft on the first 25 square centimeters of wound surface area and is commonly billed when advanced wound care products are used to promote closure. 15120 represents a split-thickness autograft to the leg and is the key procedure driving assignment to the surgical skin-graft DRG triad rather than the medical ulcer triad. 29581 covers application of a multi-layer compression wrap below the knee, frequently used for venous-etiology ulcers and billable separately from debridement on the same encounter when medically necessary.
NCCI Bundling Considerations
Debridement codes such as 11042 and 97597 are mutually exclusive of one another for the same wound on the same date and should never be billed together, since they represent different depths of the same debridement service. Skin substitute application codes like 15271 bundle standard wound cleansing and preparation into the same code and should not be billed with a separate debridement code unless the debridement addresses a clearly separate area or depth documented distinctly in the operative note. Compression wrap application (29581) is generally separately billable from debridement when performed at the same encounter, provided both services are individually documented with medical necessity.
🔬 ICD-10-PCS Crosswalk
Excision procedures on the right lower leg skin (root operation Excision, body system Skin and Breast) are used when a surgical debridement removes a portion of the ulcerated tissue without replacing it, and coders should confirm the correct body part and approach characters against a current encoder rather than assuming a static code string, since PCS body part values are highly granular by exact leg segment. Replacement procedures (root operation Replacement) apply when a skin graft or skin substitute is used to physically replace excised tissue, which is the operation that typically drives the case into the surgical skin-graft DRG triad discussed above. Extraction (root operation Extraction) is occasionally used for non-excisional mechanical debridement techniques, though most bedside wound care in the inpatient setting is more accurately captured as Excision. Coders should always verify the specific seven-character PCS code against the current Code Tables rather than relying on memory, since even small differences in approach or device character change the code entirely.
💊 Coding Scenarios and Examples
Scenario 1: A patient is admitted for cellulitis and is noted to have a “chronic right lower leg ulcer, several months in duration” on the admission H&P, but no wound care consult or formal staging exam occurs during the stay. Correct coding is L97.919 as a secondary diagnosis alongside the cellulitis code, since the documentation does not support any more specific severity. Sequencing places the cellulitis (the reason for admission) as principal diagnosis, with L97.919 reported as a comorbid condition. A CDI note is warranted here since a wound care consult, if obtained, would likely yield a more specific severity code and improve documentation defensibility.
Scenario 2: A patient with known peripheral arterial disease is admitted specifically for management of a chronic right lower leg ulcer, and the vascular surgery consult documents “wound extends to but does not involve muscle, skin and subcutaneous tissue only.” Correct coding is L97.911 rather than L97.919, since the consult clearly establishes depth limited to skin breakdown, along with the underlying atherosclerosis code sequenced first per the “code first” instruction. Sequencing places the atherosclerosis-with-ulceration code first, followed by L97.911, reflecting proper etiology-first sequencing for lower extremity ulcers.
Scenario 3: A patient undergoes a split-thickness skin graft to a chronic right lower leg ulcer during the inpatient stay, with the pre-operative note describing “unspecified depth, chronic non-healing ulcer” because no formal staging was documented before surgery. Correct coding remains L97.919 as the diagnosis, paired with the appropriate ICD-10-PCS Replacement code for the graft procedure. Sequencing places L97.919 as principal diagnosis since the ulcer is the reason for the surgical admission, and the case groups to the surgical skin-graft DRG triad rather than the medical ulcer triad because of the graft procedure. A CDI note should still be generated retrospectively, since intra-operative findings typically describe wound depth in enough detail to support a more specific severity code for future encounters.
⚠️ Coding Pitfalls and Tips
Defaulting to L97.919 without first checking wound care, nursing, or vascular surgery notes for depth documentation is the single most common missed-specificity error in lower-extremity ulcer coding. Failing to sequence the underlying etiology code first, such as I70.23- for atherosclerosis with ulceration, when the “code first” instruction applies is a frequent sequencing error that can understate CC/MCC capture. Confusing laterality, particularly billing a left-leg code when the documentation describes the right leg or vice versa, is a common audit finding on lower-extremity ulcer claims. Coding L97.919 when the documentation actually supports a pressure ulcer diagnosis under L89 is an Excludes2 misapplication that can trigger payer scrutiny. Omitting a secondary infection code when peri-wound cellulitis or purulent drainage is separately documented understates the true clinical picture and can affect both DRG assignment and quality metrics. Billing a debridement CPT code without corroborating documentation of the specific tissue depth debrided is a frequent audit target, since CPT and ICD-10-CM severity documentation should logically align.